hypodermis morphology trait Any measurable or observable characteristic related to the shape, structure, color, or pattern of the irregular layer of adipose and connective tissue, stroma, or membrane immediately deep to the skin and superficial to the deep fascia; usually consists primarily of either just loose connective tissue, or a fatty layer that may also include a muscle layer, and/or a fibrous layer; may also occur as a membranous layer only, being nearly devoid of fat. Trait.ontology VT:0003705 subcutaneous tissue morphology trait subcutis morphology trait skin adnexa morphology trait